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Xiao Jun read a story book. He read 42 Pages on the first day and 43 pages on the second day. He read 17% of the whole book in two days?
A: there are 500 pages in this story book
Xiaogang kneaded a cube with an edge length of 8 cm into a cuboid with a length of 10 cm and a width of 4 cm. What is the height of the cuboid?
The height of the cuboid is 8 × 8 × 8 △ 10 △ 4 = 12.8 cm
Simple calculation: 5 / 7-5 / 7 * 2 / 3 1.25 * 6 45 divided by 25
5 / 7-5 / 7 * 2 / 3
=5/7*（1-2/3）
=5/7*1/3
=5/21
1.25*6
=1.25*2*3
=2.5*3
=7.5
45 divided by 25
=45÷5÷5
=9÷5
=1.8
It is known that line L is tangent to circle x2 + Y2 + 2x = 0 at point t, and intersects hyperbola x2-y2 = 1 at two points a and B. If t is the midpoint of line AB, the equation of line L is obtained
Let the equation of l be & nbsp; X = KY + A, and substitute it into hyperbolic equation & nbsp; to get (k2-1) Y2 + 2kay + A2-1 = 0. & nbsp; & nbsp; and k2-1 ≠ 0, then y & nbsp; t = Ya + YB2 = − akk2 − 1, so XT = KYT + a = − ak2 − 1, that is, t (A1 − K2, AK1 − K2)
3 / 5x + 4 + 4 / X-1 = 3-12 / 5x-5
Take 12 on both sides
4(5x+4)+3(x-1)==36-(5x-5)
20x+16+3x-3=36-5x+5
23x+13=41-5x
23x+5x=41-13
28x=28
x=28÷28
x=1
Set M = {X / - 1 less than or equal to x less than or equal to 2}, n = {X / x-k greater than or equal to 0} and M is contained in N, find the value range of K
K is less than or equal to minus 1
Simple calculation of 50 △ 2.5 + 1.8 × 4.5
50÷2.5+1.8×4.5
=5*10/2.5+（2.0-0.2）*4.5
=5*4+9-0.9
=29-0.9
=28.1
The symmetry point of point P (2-m, 1 / 2m) about X axis is 1 / 2m > 0 in the fourth quadrant/
The point of x-axis symmetry is in the fourth quadrant, and P is in the second quadrant
2-m>0
1/2m>0
Deduce M0 from two formulas
0
When is one and two fifths?
One and two fifths is 1:24
As shown in the figure, if the images of functions y = 2x and y = ax + 8 intersect at point a (3 / 2), then the solution set of inequality 2x > ax + 4 is
three-seconds
Substituting y = 3 into y = 2x, we get x = 3 / 2,
Ψ point a (3 / 2,3)
Substituting y = ax + 4,
We get 3 / 2A + 4 = 3,
∴a=-2/3
The original inequality is 2x
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- 12. Xiao Jun read a story book. He read 42 Pages on the first day and 43 pages on the second day. He read 17% of the whole book in two days?
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- 14. Xiaojun's original storybooks are three times as many as Xiaoli's. Xiaojun bought seven more. After Xiaoli bought six, Xiaojun's books are twice as many as Xiaoli's?
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- 17. When Xiao Jun reads a story book, the ratio of the number of pages he has read to the number of pages left is 2:3. Xiao Hui, a good friend of Xiao Jun, finds that the number of pages Xiao Jun has read is 28 pages less than three-quarters of the total pages of the story book. How many pages does the story book have?
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